Battery Cell Tab Sealing Geometry for Stronger Pouch Adhesion
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Solution Overview
Problem
The existing battery cell packaging technologies using aluminum laminated films often result in inadequate sealing at the tab, leading to potential liquid leakage, reduced battery life, and safety issues due to weak adhesion between the tab and the sealing adhesive layer.
Innovation Solution
A battery cell design featuring a first sealing adhesive layer with a larger cross-sectional size than the second sealing region, including central and protruding blocks with arc edges, enhances adhesion strength and peeling force, ensuring a tighter packaging and increased sealing area at the tab.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional sealing adhesive layer is used to package the battery cell body, then the packaging process is simple, but the adhesion strength and peeling force between the tab and pouch package are insufficient, leading to potential liquid leakage and packaging failure
Solution Approach 1:
The sealing adhesive layer is divided into multiple regions with different cross-sectional sizes. The first sealing region has a larger cross section than the second sealing region, creating segmented zones that provide different functional characteristics. This segmentation allows the sealing layer to simultaneously achieve strong adhesion at the tab area while maintaining overall packaging integrity.
Solution Approach 2:
Different regions of the sealing adhesive layer are designed with different local properties. The first sealing region, located at the tab area, has a larger cross-sectional size to provide enhanced adhesion strength and peeling force where it is most needed. The second sealing region has a smaller cross section, creating a gradient structure that optimizes packaging reliability at critical locations without uniformly increasing complexity throughout the entire sealing layer.
2Strength
If the sealing adhesive layer has uniform cross-sectional size, then the manufacturing process is simple, but the adhesion strength at the tab area is insufficient to prevent liquid leakage
Solution Approach 1:
The sealing adhesive layer features non-uniform cross-sectional dimensions with the first sealing region having a larger cross section than the second sealing region. This local quality variation concentrates adhesion strength where the tab requires it most, preventing liquid leakage at critical areas while maintaining manufacturability through controlled dimensional variations rather than complex multi-component structures.
Data Source
AI summary
A battery cell includes a battery cell body including a tab and a packaging body including a first sealing adhesive layer, the first sealing adhesive layer includes first and second sealing regions, and along a direction from the battery cell body to the tab, a size of a cross section of the first sealing region is greater than a size of a cross section of the second sealing region. In the battery cell, a structure of a sealing adhesive layer is improved, which improves an adhesion strength and a peeling force between a tab and a packaging body, so as to improve a packaging strength at a tab, thereby improving a packaging quality of a battery cell, and thus ensuring an effective safety service life of a battery, and solving a problem of a failure of a battery cell caused by inadequate sealing at a tab of a battery cell.